Hi all, two seperate exchange organizations and two way forest trusts between company A and company B Can we assign send on behalf of rights to company B user for mailboxes in company A forest? (When I assigned, I got the error "A constraint violation occurred") Thank you

Hi, Did you checked the permission issue?The Company B user must have permission to access mailboxes in company A forestRegards from www.windowsadmin.info

hello John, Please check the trust relationship between two forests.

Thank you. I even assignd the full mailbox permission to company B user in company A forest. Two-way trust relationship built. Could it be the reason which there is Exchange 2003 in Forest A and there is exchnage 2007 in forest B?

Hi John, Based on my experience, Exchange in Forest A and there is exchange 2007 in forest may not the reason to this issue. For this issue, I suggest you to check whether your users have “send on behalf of permission” included. You can use get-mailbox xxx |fl GrantSendOnBehalfTo to check whether user has been assign send on behalf of permission. If you have not assigned send on behalf of permission to your users, please use these commands to assign the “send on behalf of permission”: Note: (Testmbx: the mailbox which you will be used to assign “send on behalf of permission. Jaredz: the user who will be assigned “send on behalf of permission”) # Grant "Send on behalf" permission Set-Mailbox testmbx -GrantSendOnBehalfTo jaredz Here are some related articles for you: Exchange Server 2007 recipient management one-liners http://msexchangeteam.com/archive/2006/09/05/428833.aspx If the problem persists, please feel free to let me know and I will be glad to help. Best Regards, Evan